If these frozen layers of ice were gemstones, I would have to have some in the shop!

It is Lake Baikal is a rift lake in Russia, located in southern Siberia. A rift lake is a lake formed as a result of subsidence related to movement on faults within a rift zone, an area of extensional tectonics in the continental crust. They are often found within rift valleys and may be very deep. Rift lakes may be bounded by large steep cliffs along the fault margins.